Princeton scientists have introduced a new form of
piezoelectric material, a rubber sheet that when stretched and strained, converts mechanical energy to electrical energy. The sheets are made of organic lead zirconate titanate, layered over silicone with an embedded chip. Imagine the interior of tires lined with this, gaining energy simply from the pressure of the road; or, as
PhysOrg notes, a pace maker that can retain energy from each pump. Click the above links for the full articles and studies.
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Now that's cool.
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